Double glazed window



Aug. 4,1936. 7 c. E. STROUD 2,049,528 v DOUBLE GLAZED WINDOW Filed July 3, 1935 5 g /a I I 1* 1 2. IL I]:

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INVEN TOR. CHHRLESE Sraoub TORNEYS.

Patented Aug. 4, 1936 UNITED STATES PATENT OFFICE Pittsburgh Plate ,AIlegheny County, Pa., a corporation of Pennsy Application July 3, 1935, Serial No. 29,690

2 Claims. (Cl. 20-565) The invention relates to double glazed windows oi the type shown in the Parkinson and Hamill application, Serial No. 755,924, in which the glass unit is made up of a pair of glass sheets clamped together by edge strips of U cross section with suitable separator means between the sheets at their edges for spacing and sealing purposes. The invention relates more particularly to the means employed for securing the edge strips together where they meet at the corners of the glass sheets. Heretofore, this has ordinarily been done by the use oi. solder, or the like, which gives suflicient security, but which in some cases, causes injury to the sealing material incident to the heat ll required, and makes the strips difllcult of sew ration when it is necessary to disassemble a unit for replacements or repairs. The primary ob- ;Jects of the present invention are to provide an improved construction for securing the edge 7 strips at the corners, (1) which is of good appearance and adds nothing to the thickness of the unit; (2) which adds little to the cost of the unit and joins the strips with suiflcient security; and (3) which may be assembled and disassembled with a minimum of labor. Certain embodiments of the invention are illustrated in the accompanying drawing, wherein: Figure l is a side elevation oi. the unit. Fig. 2 I is a section on the line II--Il 01 Fig. 1. Figs. 3, 4 and 5 are detail views of the interlock or joint between two of the strips at the corner of the unit, Fig. 3 being a front view, Fig. 4 an edge view. and Fig. 5 a rear view. Fig. 6 is a plan view of one end of one of the strips showing how it is stamped preliminary to bending it intochannel form. and Figs.' 7 and 8 illustrate modifications of the interlock. Y

Referring to the drawing, l and 2' are glass sheets having the sealing strips 3 of rubber between their edges, and l, 5, 6 and l are the edge strips of. U cross section formed from light spring sheet metal, such as iron, brass or composition.

The interlock 'at the corners of the unit, to which the invention particularly relates, is the same at each 01' the tourcorn'ers, and is formed by providing each flange of each strip with a slot and a tongue adapted to inter-engage with a tongue and slot respectively formed in the flanges of the other strip. For instance, the strip 5 has its front flange (Figs. 1 and 3) cut away to form the tongue I with a slot thereabove into which flts the tongue 9 on the front flange of the strip 4. Looking at the back of this same joint, as shown in Fig. 5,.the strip 5 has a tongue llhvhich flts intoaslotinthestriplwhilethestriplhasa tongue II which ilts into a slot in the strip I. The webs oi! the two channel strips abut each other, as indicated at II. It will be noted that thetonguesotthefrontflangeotthestrlplis atrightanglestothetonguelloiitsrearflange, 5 and that the tongue I o! the front flange of the strip 5 is at right angles to the tongue ll of'the rear flange. Each stripis thus locked by the other strip against outward movement; that is,

against movement tending to disengage the strip from the glass sheets. Since the material of the strips is thin, springy, sheet metal, no difliculty is experienced in sliding the ends into the interengaging positions shown where the tongues of one strip snap into the corresponding slots of the 5 opposing strip. The joints thus formed are sumciently secure to prevent accidental displacement, but at the same time permit the ready dis- 'engazementotthestripswhenthisisnecessary' :ior replacement or repairs. V 20 The method of stamping'out the ends of the stripsprelinunarytobendingto ehanneiformwill be seen by reference to Fig. 6, wherein 9 and II are the tongues heretofore referred to on the strip 4, and I3 and II arethe slotsfor receivin the% tongues 8 and II of the strip 5. The slots are in all cases of the proper dimensions to receive the tongues, and the strip is subsequently bent along thedottedlines l5 and I6 togiveitthenecessary channel form. 30 Fig. 7 illustrates a modification wherein the tongue-l1 otthestrip llismade of dovetailshape and fits into a slot of corresponding shape in the strip is so that each interlock prevents relative motion 01 the strips in both directions. In other 35 in pe ts. the construction follows that heretofore described.

Fig.8followstheconstruction of Fig. 7, diflferingonlyinthe shapeotthetongue 2lonthe sh-ipzlwhiehfltsintoaslotofsimilarshapein 40 the strip 22. The structuresofFigs.'land8have '-thedlsadvantagethatthetonguesl1and2lare weaker than those of the preferred construction 01 figs. 1 to 6 and involve more difllculty' in assemblinganddisassembling. Thechannelstrips 45 shown in all the modiflcatiomt are 0! one piece construction, but if desired, may be made up of two opposing angles suitably secured together.- What I claim'is:

1. In combination with a pair of glam plates in 50 parallel with spacing means between their edges, metal clamping strips of channel shape fitting aroundtheedgesottheshoemand securing .meansfor thestripsatthecornersotthesheets wherethestripsmeehcomprisingatonguc and slot interlock between the flanges of the meeting strips on each side oi. the pair of sheets, each flange of each strip having a tongue and a slot in parallel with each other but with the tongue and slot of the one flange at right angles to the tongue and slot of the other flange, so that when the tongues and slots of the two strips are interlocked with each other, each strip is prevented from moving relative to the other.

2. In combination with a pair of glass plates in parallel with spacing means between their edges, metal clamping strips of channel shape fitting around the edges of the sheets, and securing means for the strips at the corners of the sheets where the strips meet, comprising a dovetail tongue and slot interlock between the flanges of the meeting strips on each side of the pair of sheets interengaging so that each strip prevents movement of the other strip outwardly with respect to the glass sheets.

CHARLES E. STROUD. 

